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Stainer, thanks for sharing the presentation about myths and facts on VFDs & Pumps.

Thanks all of you. I got a solid perspective of different scenarios to be discussed with the water company.

I agree a single PCV can simplify the pressure control. I assume VFDs stability problems can be handled in Auto-stagging configuration when the lag pump can handle pressure control variations after the Lead pump has reached top rpms to meet demand. I have done it before with Gas booster units...

Good points cvg. I am contractor, however some reasons by the City water company are: 1-Old pumping system has more than 50 years. Maintenance and operational costs, unmatched new standards plus parts availability are weighing in. 2- Lack of funding to retrofit pipelines, as projects' budget...

Thanks cvg and BigInch for your feedback, I already did some research in these forums but I couldn't find advice on using the efficiency curves for predicting/limiting VFD min. and max. performance from an Electrical engineering perspective. Apology if I write/ask thinking about some other...

I am Electrical engineer looking for some hydraulic/mechanical advice on convenience of implementing pressure control by VFD in (3) 40 HP vertical turbine pumps. The brand new booster Pumps station has never being in service for 10 years as city customers complain about the high rate/pressure...